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^(01 NOVEMBER 2009).How the penis works. https://www.health24.com/Lifestyle/Man/Your-body/How-the-penis-works-20120721
^Wischhover, C. March 14, 2018. Vaginas 101: Everything You Need to Know About the Vagina. https://www.teenvogue.com/story/vagina-anatomy-diagrams
^Wayne Weiten; Margaret A. Lloyd; Dana S. Dunn; Elizabeth Yost Hammer (2016). Psychology Applied to Modern Life: Adjustment in the 21st century. Cengage Learning. p. 349. ISBN 1305968476. Retrieved March 11, 2017. Anal intercourse involves insertion of the penis into a partner's anus and rectum.
^ a b c d e f g h i j k l See pages 270–271 for anal sex information, and page 118 for information about the clitoris. Janell L. Carroll (2009). Sexuality Now: Embracing Diversity. Cengage Learning. pp. 629 pages. ISBN 978-0-495-60274-3. Retrieved December 19,2010.
^ a b c d e f g h i j k "Anal Sex Safety and Health Concerns". WebMD. Retrieved August 19, 2013. Often referred to simply as anal sex, anal intercourse is sexual activity that involves inserting the penis into the anus.
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^ World Health Organization, Department of Reproductive Health and Research Global strategy for the prevention and control of sexually transmitted infections: 2006–2015. Breaking the chain of transmission, 2007, ISBN 978-92-4-156347-5
^ a b c Joann S. DeLora; Carol A. B. Warren; Carol Rinkleib Ellison (2008) [1981]. Understanding Sexual Interaction. Houghton Mifflin (Original from the University of Virginia). p. 123. ISBN 978-0-395-29724-7. Retrieved November 6, 2011. Many men find anal intercourse more exciting than penile-vaginal intercourse because the anal opening is usually smaller and tighter than the vagina. Probably the forbidden aspect of anal intercourse also makes it more exciting for some people.
^ a b Hunko, Celia (February 6, 2009). "Anal sex: Let's get to the bottom of this". The Daily of the University of Washington. Archived from the original on April 28, 2010. Retrieved March 11, 2017.
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^ Joseph A. Flaherty; John Marcell Davis; Philip G. Janicak (1993). Psychiatry: Diagnosis & therapy. A Lange clinical manual. Appleton & Lange (Original from Northwestern University). p. 217. ISBN 978-0-8385-1267-8. The amount of time of sexual arousal needed to reach orgasm is variable — and usually much longer — in women than in men; thus, only 20–30% of women attain a coital climax. b. Many women (70–80%) require manual clitoral stimulation...
^ Kammerer-Doak, Dorothy; Rogers, Rebecca G. (June 2008). "Female Sexual Function and Dysfunction". Obstetrics and Gynecology Clinics of North America. 35 (2): 169–183. doi:10.1016/j.ogc.2008.03.006. PMID 18486835. Most women report the inability to achieve orgasm with vaginal intercourse and require direct clitoral stimulation ... About 20% have coital climaxes...
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^ a b c d See page 3 for women preferring anal sex to vaginal sex, and page 15 for reaching orgasm through indirect stimulation of the G-spot. Tristan Taormino (1997). The Ultimate Guide to Anal Sex for Women. Cleis Press. pp. 282 pages. ISBN 978-1-57344-221-3. Retrieved November 6, 2011.
^ a b See page 560 for effects of viewing pornography with regard to anal sex, and pages 286–289 for anal sex as a birth control method. Robert Crooks; Karla Baur (2010–2011). Our Sexuality. Cengage Learning. pp. 570 pages. ISBN 978-0495812944. Retrieved May 7, 2013.
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^ a b See here and pages 48–49 for the majority of researchers and heterosexuals defining virginity loss/"technical virginity" by whether or not a person has engaged in vaginal sex. Laura M. Carpenter (2005). Virginity lost: an intimate portrait of first sexual experiences. NYU Press. pp. 295 pages. ISBN 978-0-8147-1652-6. Retrieved October 9, 2011.
^ Bryan Strong; Christine DeVault; Theodore F. Cohen (2010). The Marriage and Family Experience: Intimate Relationship in a Changing Society. Cengage Learning. p. 186. ISBN 0-534-62425-1. Retrieved October 8, 2011. Most people agree that we maintain virginity as long as we refrain from sexual (vaginal) intercourse. But occasionally we hear people speak of 'technical virginity' [...] Data indicate that 'a very significant proportion of teens ha[ve] had experience with oral sex, even if they haven't had sexual intercourse, and may think of themselves as virgins' [...] Other research, especially research looking into virginity loss, reports that 35% of virgins, defined as people who have never engaged in vaginal intercourse, have nonetheless engaged in one or more other forms of heterosexual sexual activity (e.g., oral sex, anal sex, or mutual masturbation).
^ Jayson, Sharon (October 19, 2005). "'Technical virginity' becomes part of teens' equation". USA Today. Retrieved August 7,2009.
^ Ken Plummer (2002). Modern Homosexualities: Fragments of Lesbian and Gay Experiences. Routledge. pp. 187–191. ISBN 1134922426. Retrieved August 24, 2013. The social construction of 'sex' as vaginal intercourse affects how other forms of sexual activity are evaluated as sexually satisfying or arousing; in some cases whether an activity is seen as a sexual act at all. For example, unless a woman has been penetrated by a man's penis she is still technically a virgin even if she has had lots of sexual experience.
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